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I have a project that I regularly compile against Eigen default branch, that recently has stopped compiling on Visual Studio 2013 with this error:
~~~
"C:\projects\idyntree\build\iDynTree.sln" (default target) (1) ->
"C:\projects\idyntree\build\ALL_BUILD.vcxproj.metaproj" (default target) (2) ->
"C:\projects\idyntree\build\src\core\tests\ArticulatedBodyInertiaUnitTest.vcxproj.metaproj" (default target) (3) ->
"C:\projects\idyntree\build\src\core\idyntree-core.vcxproj.metaproj" (default target) (5) ->
"C:\projects\idyntree\build\src\core\idyntree-core.vcxproj" (default target) (6) ->
(ClCompile target) ->
c:\program files (x86)\eigen\include\eigen3\eigen\src/Core/AssignEvaluator.h(784): error C2752: 'Eigen::internal::Assignment<ActualDstTypeCleaned,Src,Func,Eigen::internal::AssignmentKind<Eigen::DenseShape,Eigen::DenseShape>::Kind,double>' : more than one partial specialization matches the template argument list [C:\projects\idyntree\build\src\core\idyntree-core.vcxproj]
c:\program files (x86)\eigen\include\eigen3\eigen\src/Core/AssignEvaluator.h(784): error C2027: use of undefined type 'Eigen::internal::Assignment<ActualDstTypeCleaned,Src,Func,Eigen::internal::AssignmentKind<Eigen::DenseShape,Eigen::DenseShape>::Kind,double>' [C:\projects\idyntree\build\src\core\idyntree-core.vcxproj]
c:\program files (x86)\eigen\include\eigen3\eigen\src/Core/AssignEvaluator.h(784): error C3861: 'run': identifier not found [C:\projects\idyntree\build\src\core\idyntree-core.vcxproj]
2 Warning(s)
3 Error(s)
~~~
For the complete compilation log, see https://ci.appveyor.com/project/robotology/idyntree/build/1.0.438/job/2bc2w78doofqidl1#L1182 .
I tried to compile the Eigen test suite, but everything seems fine for the tests.
The same project compiles fine on Visual Studio 2015 .
Given that the compilation stopped working ~4 days ago, I think that the problem could be related to this commit : https://bitbucket.org/eigen/eigen/commits/255869aaeacf697843e2b2bef165d4cd8d96c6cf .
Of from this report is not easy to identify the problem, I can work on a more self-contained example of the problem.

Update: I investigated a bit the issue, and apparently the failure is happening only in the recent days was due to the fact that AppVeyor recently updated to Visual Studio 2013/2015 Update 3.
Since this update, the error C2752 is reported (even if the Visual Studio documentation does not say anything in particular for this error: https://msdn.microsoft.com/en-us/library/z2ye41d8.aspx) .